class_name StateMachine extends Node

#export (NodePath) var starting_state
export var debug_state_machine: bool = false

# I guess I would declare a number of states here
#export (Reference) var states # Doesn't work
#var starting_state: State

var current_state: State
#var state_modifiers: Array
export(Dictionary) var states :Dictionary

# Initialize the state machine by giving each child state a reference to the
# parent object it belongs to and enter the default starting_state.
func init() -> void:
#	for child in get_children():
#		if child is State:
#			if debug_state_machine:
#				print("Initializing State Node: ", child.name)
##			child.modifier_stack_ref = state_modifiers
#			if debug_state_machine:
#				child.debug_state = true

	for s in states.keys():
		var this_state = states.s
		if this_state is State:
			if debug_state_machine:
				print("Initializing State Node: ", s)
				this_state.debug_state = true


# Change to the new state by first calling any exit logic on the current state.
func change_state(new_state: State) -> void:
	if current_state:
		current_state.exit()

	current_state = new_state
	current_state.enter()
#	if(state_modifiers.size() > 0 and debug_state_machine):
#		print("Active Modifiers:")
#		for mods in state_modifiers:
#			print(mods.name)

func change_to_known_state(new_state_name: String) -> void:
	if new_state_name.empty() == false:
		if states.has(new_state_name):
			change_state(states[new_state_name])
		else:
			push_warning("Attempt to switch state to unknown: " + new_state_name + get_parent().name)
			change_state(states["default"])
	
# Pass through functions for the Player to call,
# handling state changes as needed.
func process_physics(delta: float) -> void:
	change_to_known_state( current_state.process_physics(delta) )

func process_input(event: InputEvent) -> void:
	var new_state = current_state.process_input(event)
	if new_state:
		change_state(new_state)

func process_frame(delta: float) -> void:
	var new_state = current_state.process_frame(delta)
	if new_state:
		change_state(new_state)